Acetic Acid is found in vinegar and is in foods like salad dressing and pickles. It is what gives vinegar its pungent smell and sour taste, and has been used in homes for more than 10,000 years. Although our acetic acid isn't safe to eat, it is used as a cleaning agent that removes dirt and soils, and also as a pH adjuster that alters the pH of a product to improve stability. Every formula has an optimum pH to make it work best. For example, a formula that’s more acidic works better for soap scum removal. Its opposite, a formula that’s more alkaline, might be more effective at removing grease or greasy soils. We use pH adjusters to make sure we achieve the best pH for a particular job. Also, the pH of a formula can affect how long it lasts within a container – for example limiting its tendency to corrode an aluminum or steel can.